NYC-WTC_000196531

NYC 9/11 Public Portal Document

104 East 25th St., 10th Flooi New York, New York 1001C wvwv.atc-enviro.corr 212.353.828C Fax 212.353.830e ASSOCIATES. INC.

April 17, 2002

Mr. Bernard P. Orlan Director, Environmental Health & Safety New York City Board of Education 28-11 Queens Plaza North Long Island City, NY 11101 -4008

Re: Wipe Samples for Dioxins Public School 234M ATC Project No. 15-19125-0279

Dear Mr. Orlan:

ATC Associates Inc. (ATC) is pleased to provide this report of the results of the wipe samples for polychlorinated dibenzo-p-dioxins (PCDDs)and dibenzofurans (PCDFs) collected on March 8 and 15, 2002, at the referenced location. The New York City Board of Education (BOE) requested these samples to evaluate possible contamination in the school building per the recommendation of Environ Corp., consultant to the parents association..

SCOPE OF WORK

The samples were collected using gauze pads and hexane as a solvent. The pads and solvent were provided and samples were analyzed by Pace Analytical Services, Inc. (Pace) of Minneapolis, MN, a laboratory experienced in dioxin analysis. The analysis was performed by modified EPA Method 8290 using combined capillary column gas chromatography/high resolution mass spectrometry.

Wagdi Abdelshahid, Industrial Hygienist of ATC’s New York City office, collected the samples.

The sampling was performed consistent with generally accepted industrial hygiene practices. There were inherent limitations created by constraints of time, operational and work practice variability, variations in contaminant concentrations, and sampling and analytical accuracy. The results of the sampling represent conditions found on the date the samples were collected.

RESULTS

ATC submitted two (2) wipe samples, collected on each day, for PCDDs/PCDFs to Pace for analysis. Copies of the laboratory analysis reports are provided in the Attachment. Samples were taken from areas specified by the parents association consultant. The area of each sample one (1) square meter (1 m2).

The New York State Department of Health (NYSDOH) established guidelines for dioxin for the re-occupancy of the Binghamton State Office Building following a PCB fire. The NYSDOH guideline for dioxin on surfaces is 25 nanograms per square meter (25 ng/m^).

CITY_21MC100_003057436

NYC-WTC_000196531